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Phys. Rev. B 70, 045324 (2004) [8 pages]

Integer filling factor phases and isospin in vertical diatomic artificial molecules

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D. G. Austing1,2, S. Tarucha1,3, H. Tamura1, K. Muraki1, F. Ancilotto4, M. Barranco5, A. Emperador5, R. Mayol5, and M. Pi5
1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan
2Institute for Microstructural Sciences M23A, National Research Council of Canada, Ottawa, Ontario K1A OR6, Canada
3Department of Physics and ERATO Mesoscopic Correlation Project, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
4INFM (Udr Padova and DEMOCRITOS National Simulation Center, Trieste, Italy) and Dipartimento di Fisica “G. Galilei”, Università di Padova, via Marzolo 8, I-35131 Padova, Italy
5Departament ECM, Facultat de Física, Universitat de Barcelona, E-08028 Barcelona, Spain

Received 11 March 2004; published 30 July 2004

Integer filling factor phases of many-electron vertically coupled diatomic artificial quantum dot molecules are investigated for different values of the interdot coupling. The experimental results are analyzed within local-spin density functional theory for which we have determined a simple lateral confining potential law that can be scaled for the different coupling regimes, and Hartree-Fock theory. Maximum density droplets composed of electrons in both bonding and antibonding or just bonding states are revealed, and interesting isospin-flip physics appears for weak interdot coupling when the systematic depopulation of antibonding states leads to changes in isospin.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.045324
DOI:
10.1103/PhysRevB.70.045324
PACS:
73.21.La, 36.40.Ei, 71.15.Mb
 
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